/usr/share/doc/libkhtml5/changelog.Debian.gz is in libkhtml5 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libkhtml5/../libkdecore5/changelog.Debian.gz
/usr/share/doc/libkhtml5/../libkdecore5/changelog.Debian.gz